Originating in the Scottish lowlands, houndstooth hasn’t travelled too far to make it into <b><a href=" http://www.selfridges.com/cat/PS-by-Paul-Smith/" style="text-decoration: none"><font color="black">PS by Paul Smith</font></a></b>’s collections. A marker of refined menswear since its 1800s invention, the tonal check is modernised by the British diffusion line via this tailored-fit shirt. Cut to a streamlined silhouette and topped with a button-down collar, it’s smart with chinos and casual when layered loose over a crewneck tee to complement denim.